Yes, one S9 with noctua silent fans replaces a 750W resistive heater in basement office. It's a loss investment as a 30€ resistive heater from the hardware store would have better upfront cost. So, it's a hobby to go down the mining rabbit hole and support decentralized mining. Daily reward currently is ~2000sats with a 35 ct (Euro) / kw. Braiins pool but thinking to switch to ocean.xyz or split hashrate.